Shield for furnace-doors



2 Sheets-Sheet 1Q (No Mudel.)

SWINDELL. Shield for Furnace Doors.

Patented Feb. 22,188l.

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(No Model.) 2 Sheets-Sheet 2.

W SWINDELL. Shield for Furnace Doors.

No. 238,182. Patented Feb. 22, I881.

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NlTED STATES PATENT OFFICE.

NVILLIAM SWINDELL, OF ALLEGHENY, PENNSYLVANIA.

SHIELD FOR FURNACE-DOORS.

SPECIFICATION forming part of Letters Patent No. 238,182, dated February22, 1881.

Application filed September 10, 1880. (No model.)

To all whom it may concern Beit known that I, WILLIAM SWINDELL, ofAllegheny, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in Shields for Furmace-Doors; andI do hereby declare the following to be a full, clear, and exactdescription thereof.

My invention relates to water-cooled shields for iron, steel, and otherfurnaces. The doors of such furnaces rise in opening, being operatedeither by a lever or by a Windlass or crank and pulley.

My invention consists of an improved shield fastened to and operatingwith the door. The door usually remains closed during the working of thefurnace, except at the time ofcharging or discharging. While theseoperations are going on the shield cannot remain in front of the door,so that for all practical purposes when attached to the door it isalways in position.

To enable others skilled in the art to make and use my invention, I willnow describe its construction and operation by specific reference to theaccompanying drawings, in which- Figure'l, Sheet 1, is a side elevationof a puddling or boiling furnace of the usual construction provided withmyimprovement. Fig. 2 is a vertical cross-section on the line as m ofFig. 1. Fig. 3 is a vertical cross-section of the furnace-door andshield. Fig. 4. is a view of the teloscopic joint of the water-pipes.Fig. 5, Sheet 2, is a front elevation of a steel-furnace provided withmy improvement; and Fig. 6 is a vertical cross-section of the same.

Like letters of reference indicate like parts in each.

In the puddling-furnace a, Sheet 1, the door b is raisedand lowered by alever, c, pivoted at c, and connected to the door by a chain, 0

Attached to the door b, by suitable metallic braces d, bolted thereto,is the shield e, which is made of two iron plates, 6 and a united, withan air-space, 0 between them, by short angle or flanged iron braces ebolted to them.

Extending along above the side of the furnace, over the door, is awater-pipe, f, slotted or perforated, as at f, on the side next to theshield, so as to discharge a film or spray of water against the side ofthe plate 6 next to the furnace.

Fastened to the lower edge of the plate 6, and extending the full lengthof the shield, is a metallic trough, g, which receives the water thatflows down over the surface of the plate a, andconducts it to adischarge-pipe, h, extending laterally, and then, by a bend, downwardfrom one end. To provide for the movement of this pipe with the door, Ihave run it into a larger pipe, h, of sufficient length to permit itsmovement without disconnection therefrom. This pipe may, if desired,lead to and discharge into the trough or box in which the operator coolshis working-tools, and thus save the necessity of supplying it withwater from any other source. The application of the water to the shieldon the side next to the furnace guards more efiectually against thewarpin g of the shield, and causes any steam that may be generated torise between the shield and the furnace, and not outside, in the face ofthe workman.

On the outer side of the plate e I bolt aseries of ribs or flanges, c ofeven depth, and then fill the surface flush with cement e brick, orother refractory material. This serves for greater protect-ion againstheat, and prevents warping, which is also the function of the airspace 6If desired, the air-space may be omitted and the flanges c and cement eplaced on the outer face of plate 6 or the flanges and filling may beomitted.

The shield is provided with a work-hole corresponding to that of thedoor I).

In connection with the steel-furnace on Sheet 2 I have shown a modifiedform of shield. In this there is but one plate, 0, and bolted to theinside are a series of troughs, 2', running from end to end and inclinedzigzag to each other. The upper trough is fed with water from a pipe,42, fastened to the door, and connected with a supply-pipe, m, by ateloscopic joint similar to that shown in Fig. 4. The water flows frompipe 11. down through the zigzag trough 13 into trough g, and thence bydischarge-pipe h, as described.

It is apparent that the shields, with their troughs and flanges, may becast in one or more pieces, or that they may be made of wrought-iron.

The advantages of my improved shield consist in its cheapness andsimplicity of con struction; in the fact that it requires no labor tomove it or attention to keep it in order; that when the fire is put outin cold weather the water will drain out and will not freeze in it, orif any should remain and freeze that it can do no damage, as the troughsare all open; and, lastly, in its durable construction.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A shield for furnaces attached to and moving with the door, andhaving a watertrough on its inner face at or near the bottom andcommunicating with a discharge pipe or conduit, substantially as and forthe purposes described.

2. A shield for furnaces combined with a water-supply pipe so as to havea stream or jet of Water flowing on or over the side next the furnace,and having a water-trough at or near the loweredge leading to adischarge, substantially as and for thepurposes described.

3. A shield for furnaces having a series of zigzag troughs on. one side,substantially as and for the purposes described.

4:. A shield for furnaces having a "ertical movement connected to supplyand discharge Water-pipes, or either, by a sliding telescopic joint,substantially as and for the purposes described.

5. A shield for furnaces having a trough on its inner side at or nearthe bottom, and an outer side faced with brick or other refractorymaterial, either with or without an air-space extending verticallythrough it, in combination with a water-pipe capable of discharging ajetor stream of water on its inner side next to the furnace, substantiallyas and for the purposes described.

In testimony whereof I have hereunto set my hand.

WILLIAM S WINDELL.

Vitnesses:

Tnos. B. KERR,- FRANK W. SMITH.

